System and method for urban sewage chemical-biologic composite deep phosphorous removal

Abstract

The present invention is combined chemical and biological system and method for removing phosphorus from city sewage, and relates to city sewage treatment. The system has one combined aerating and settling tank comprising aerating tank, secondary settling tank and chemical adding device; and one parallel combined aerating and settling tank comprising desilter and primary settling tank. The method features the combination of biological phosphorus removal and chemical flocculating phosphorus removal and simultaneous completion of removing phosphorus and denitrogenation in the same aerating tank. The system has compact structure, less covered area and low power consumption; the method is simple, fast, high in phosphorus removing effect; and the present invention may be used widely in treating city sewage, especially city sewage with high phosphorus content.

Description

1. Technical field [0001] The invention belongs to the technical field of sewage treatment, and particularly relates to an urban sewage treatment system and a treatment method. 2. Background technology [0002] In the mid-1970s and 1980s, most of the urban sewage treatment processes were traditional activated sludge methods, which mainly aimed at removing COD (chemical oxygen demand), and did not require high nitrogen and phosphorus indicators in the treated effluent. In recent years, people in cities and towns generally use washing machines to wash clothes, etc., and use a lot of phosphorus-containing substances such as washing powder, which not only increases the amount of urban sewage, but also increases the phosphorus content in sewage. With the development of society and the continuous improvement of people's living standards, the requirements for urban sewage treatment will become higher and higher, and the indicators for phosphorus and ni...

AI Technical Summary

Problems solved by technology

Although this method can effectively remove phosphorus, three operating units are added to the sewage treatment device of this method, that is, a denitrification tank is added between the aeration tank and the sedimentation tank, and a phosphorus release tank and a chemical phosphorus removal tank are added after the sedimentation tank. Pool, which increases the floor area, increases investment, increases energy consumption, increases sewage treatment costs and other shortcomings

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